#include<iostream>
using namespace std;

class example {
    private:
        const int num;
        int& ret;
    public:
        example(int n,int f):num(n),ret(f) {
            cout << "init const and reference var must be using initialize list" << endl;
        }
};

int main () {
    example(5,6);
    return 0;
}
